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The standard method for specifying the dimensions of a American Wide Flange Beam is for example W 310 x 250 x 79, which is 310 mm deep, 250 mm wide and with a weight of 79 kg/m.
The American Institute of Steel Construction (AISC) provides a comprehensive list. For example, if a beam has a height of 15.72in, a flange width of 15.80in, a flange thickness of 1.560in, and a web thickness of 0.980in, then it is a W14 x 211. The âWâ indicates that it is a wide flange beam (as opposed to, say, an S beam); the â14â is referenced as section number; and the â211â indicates that the beam weighs 211 lbs per foot.